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The idea of dark matter particles coupled only gravitationally is minimalistyet viable. Assuming an additional $Z_2$-breaking linear coupling of scalarcurvature to the dark matter scalar (gravity portal) Refs. arXiv:1603.03696 andarXiv:1611.00725 claimed a strong parametric growth of the dark matter particledecay rate with its mass, which implies pronounced phenomenological signaturesfor the model. This peculiarity was attributed by the authors to theenhancement due to the presence of longitudinal gauge bosons in the finalstate. Quite unfortunately there were overlooked cancellations in thetree-level amplitudes. There is no miracle: all perturbative decay rates aresuppressed by the strong coupling scale.

No Miracle in Gravity Portals